After a real failover, the DR site becomes the new production site. Administrators would reverse the replication direction and re-protect the DR site as described above. However, at some later point, they may decide to failback to the original state. A short downtime will need to be scheduled.
To accomplish this, we follow the following process:
- Gracefully stop the production applications at the original DR site
- Stop Oracle databases on the original DR site
- Stop ASM instances on the original DR site
- Demote the oraprd12-pod-dr pod using the quiesce option
- Promote the oraprd12-pod pod
- If required, make the necessary changes to the network load balances/DNS server to redirect connections to the PROD site
- Start ASM instances, rescan disks, make sure disk groups are mounted
- Start Oracle databases on PROD site
- Start application processes